[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

US4587394A - Device and method of welding nuclear fuel assembly structural elements - Google Patents

Device and method of welding nuclear fuel assembly structural elements Download PDF

Info

Publication number
US4587394A
US4587394A US06/532,929 US53292983A US4587394A US 4587394 A US4587394 A US 4587394A US 53292983 A US53292983 A US 53292983A US 4587394 A US4587394 A US 4587394A
Authority
US
United States
Prior art keywords
guide tubes
welding
gun
rows
carriage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/532,929
Other languages
English (en)
Inventor
Bernard Vere
Biryoukoff Maura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US4587394A publication Critical patent/US4587394A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/334—Assembling, maintenance or repair of the bundles
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C21/00—Apparatus or processes specially adapted to the manufacture of reactors or parts thereof
    • G21C21/02—Manufacture of fuel elements or breeder elements contained in non-active casings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B23K37/02—Carriages for supporting the welding or cutting element
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the invention relates to the welding of structural elements to constitute the skeleton of fuel assemblies for nuclear reactors.
  • the skeleton of a fuel assembly must be so mounted as to avoid the appearance of stresses or of weak points, sources of welding ruptures.
  • the fixing of the inner guide tubes to the grids is moreover very inconvenient, due to the difficulty of access into the bundle.
  • the guide tubes were fixed to the grids by welding when the constituent materials of the guide tubes and of the plates constituting the grids were compatible.
  • the manual forming of welds on four longitudinal lines of each guide tube in contact with the plates represents very long, troublesome operation of uncertain reliability, due to the difficulties of correctly positioning the welding tool.
  • the invention provides a welding device comprising (a) frame arranged to receive the assembly constituted by guide tubes and structural elements and maintaining them in the arrangement wherein they must be welded; (b) at least one welding assembly comprising a carriage provided with means enabling it to be moved over the frame parallel to the guide tubes and comprising at least one welding clamp mounted on the carriage through means enabling it to be moved transversely to the direction of movement of the carriage, and, rotating it between an orientation in which the clamp can pass between two adjacent rows of tubes and an orientation in which it comes to grip a tube at the place of the weld to be formed; and (c) means enabling the application to the clamps of the electrowelding pulses.
  • each carriage will advantageously bear a clamp by means of a table with cross movements in the direction of the rows and the perpendicular direction.
  • Orientation means of the clamp will be provided to bring the latter, from the passage orientation, in two opposite orientations enabling intervention successively on two tubes without translational movement of the clamp.
  • each welding unit may be provided.
  • four units arranged at 90° to one another will advantageously be provided in order to weld the tubes along two sets of longitudinal lines also at right angles.
  • the welding device according to the invention can be completed by means enabling the placing in guide tubes, at the level of the structural elements, of mandrels to be brought into contact with the wall of the guide tubes by radial expansion so as to reinforce the guide tube locally.
  • a method of welding nuclear fuel assembly guide tubes to structural elements distributed along the guide tubes including the steps of preassembling all guide tubes and structural elements on the frame and moving along the frame, parallel to the guide tubes, at least one electric resistance welding clamp to bring it to the level of the welds to be formed on a structural element.
  • the clamp is moved transversely to the direction of the guide tube while keeping it in an orientation in which it can pass between two adjacent guide tubes.
  • the clamp is then rotated around the direction of transverse movement to bring it into engagement on the guide tube at the place of a weld to be formed; the clamp is closed and an electrical welding pulse is sent therein; the clamp is brought back to its original orientation, and the sequence is initiated again on another guide tube.
  • FIG. 1 is a schematic diagram in elevation showing a grid fragment on which the guide tube is fixed
  • FIG. 2 is a diagrammatic view in elevation showing an assembly bench designed for the pre-assembly of the structural parts of a fuel assembly
  • FIG. 3 is an end view of the frame of a device according to the invention with an assembly framework after pre-assembling
  • FIG. 4 is an end view showing the movable welding equipment straddling the framework mounted on its receiving stand
  • FIG. 5 is a longitudinal sectional view of a welding clamp unsable in the equipment of FIG. 4,
  • FIG. 6 is a diagram showing the terminal portion of the clamp, in section along the line VI--VI of FIG. 5,
  • FIG. 7 is a detailed view showing a modification of the welding clamp in axial section
  • FIG. 8 is a view, in elevation and in partial section, of an equipment for the insertion of expandable mandrels into the guide tubes,
  • FIGS. 10A and 10B show, respectively in section along the axis and from the right, the terminal portion of an expandable mandrel usable in the equipment of FIG. 8,
  • FIG. 11 which corresponds to a fragment of FIG. 4, shows the arrangement of the guide tubes to be welded and the marks enabling the welding sequence to be defined.
  • FIG. 1 shows a fragment of the grid 4, constituted of plates 1 formed with projecting tongues 2 which contact a guide tube 3.
  • the guide tube and the plates are generally made of one of the zirconium base alloys called "zircaloy”.
  • FIG. 2 shows diagrammatically a mounting bench 7 on which the pre-assembly can be carried out.
  • This bench 7 includes a receiving support for pre-positioning tooling 11 formed by swingable clamps 9 and 10, connected by bracing rods 8.
  • the grids 4, the guide tubes 3 and the end part 5 to which the guide tubes 3 are temporarily fixed, for manufacturing purpose, are placed in position in the tooling 11.
  • the length of the bracing rods 8 is such that the clamps 10 are at the same longitudinal level as the end parts 5 while the clamps 9, four in number in the embodiment illustrated, are at the level of grids 4.
  • the grids 4 and the end parts 5 can be tightly retained by the clamps of the tooling 11 so as to constitute an assembly which can be handled as a unit.
  • the location of a fuel element 6 has been shown in dot-dash lines in FIG. 2, but in reality the fuel elements 6 are only placed in position in the grids after the latter are welded to the guide tubes 3.
  • the device according to the invention comprises, in the particular embodiment which will now be described, a stand 12, shown in FIG. 3, designed to receive the assembly constituted by the fuel assembly framework and its positioning tooling.
  • the stand bears clamping jacks 13 for rigidly securing at least one of the clamps 10 of the tooling to the stand.
  • the device further comprises a bed frame 14, formed, for example, by a welded unit, provided with guide rails 15.
  • the stand 12 is fixed to the bed frame in an orientation such that the guide rails 15 are parallel to the guide tubes of a framework borne by the stand.
  • the device comprises also a mobile welding equipment 16, shown as a whole in FIG. 4.
  • This equipment comprises a carriage 17, which will generally be a welded unit, provided with guide bearings 18 on rails 15, on which are placed four welding assemblies 22, 23, 24, 25, the first three of which are only shown in FIG. 4 in outline, for greater simplicity.
  • the carriage 17 is provided with means enabling its movement on the rails 15 along the stand 12, constituted by a motor 19 for driving a pinion which meshes with a rack fast with the stand 12.
  • Carriage 17 carries in addition means enabling it to be retained accurately and positively at the work sites of the welding units 22 to 25.
  • the retaining means are constituted by a jack 20 borne by the carriage and capable of applying a brake shoe to one of the rails 15.
  • the carriage 17 is provided with measurement means, which can include a rule (not shown) fixed to the stand 12 and detection means, for example magnetic, also not shown.
  • the carriage 17 is equipped with centering means constituted, in the embodiment illustrated, by a jack 21.
  • the four welding units 22 to 25 have the same construction.
  • the unit 25 shown in FIG. 4 comprises a table 26 with crossed movements enabling the weld clamp 28 to be moved in two directions X and Y, the constitution of which can be conventional. The movements are for example ensured by stepping motors 27.
  • the spot welding clamp 28, which will be described in detail below, is provided with a jack 29 for moving the jaws of the clamp toward each other and provided with a force detecting sensor, and with a double-acting jack 30 for rotating the gun enabling the head 28a of the gun to be given three angular positions at 120° from one another.
  • a detector associated with the clamp advantageously of magnetic type, can be provided to detect the arrival of the clamps in their predetermined orientation.
  • the clamp shown by way of example in FIGS. 5 and 6 is water cooled and permits a high operating rate.
  • This clamp 28 can be regarded as having a rod, of sufficiently small cross section to pass between two adjacent rows of guide tubes 3, and a head 28a, of also rather small width so that it can pass between two rows of guide tubes when in a suitable orientation.
  • the clamp comprises two coaxial tubular arms 31, 32, whose bulged ends constitute the head and bear dismountable electrodes 33 and 34, fixed by any suitable means, such as screws 35.
  • the annular space 36 between the arms 31 and 32, the radial holes formed in the arm 32 in front of the head, and the central bore of the arm 32 constitute a cooling circuit which can be connected, through holes 37 and 44 provided in connecting sleeves 40, 43 and flexible members (not shown) to a water supply circuit, (not shown).
  • the tubular arms serve for the electrical supply of the electrodes and hence must be insulated from one another.
  • the centering bearings 38 and 39 of the arms are constituted by insulating materials.
  • the outer arm 31 is free to rotate in the sleeve 40, but retained by it against translational movement.
  • the sleeve 40 is not fixed directly to the table 26, but borne by a slide 41 slidable on the table 26.
  • An elastic stop 42 tends to restore the arm to rest position, shown in FIG. 5.
  • the slide 41 contains the double-acting jack 30 for orienting the gun, as will be seen below.
  • the penumatic clamping jack 29 is connected to the inner arm 32 through a coupling connector comprising the sleeve 43 and enabling replacement of the gun.
  • the arms 31, 32 are provided with electrical connecting parts 45, 46 enabling current pulses to be applied to the electrodes, from an external source (not shown).
  • the gun 28 is shown in welding position on a guide tube 3. This head has a shape enabling it to rock from a position where it passes between two adjacent rows (FIG. 6) to a position where it frames a guide tube without being hampered by the adjacent guide tubes (FIG. 5).
  • the jack 29 moves the arm 32 until the electrodes 34 comes into contact with the tongue 2, already in contact with the guide tube 3. Due to the fact that the sleeve 40 connected to the arm 31 is floating on the slide 41, a back reaction to the traction force developed by the jack 29 is generated and, due to the elastic stop 42, the arm 31 is moved in opposite direction to the arm 32 until the electrode 33 is in contact with the tongue 2 diametrically opposite the tongue 2 in contact with the electrode 34.
  • the elastic stop 42 hence enables an identical clamping force (normally of the order of 15 kg) to be obtained on the diametrically opposite longitudinal lines of the guide tube which is to receive the spot weld for connection with the tongue 2.
  • FIG. 6 the method of rotating the rod and head of the gun 28 appears more clearly.
  • the two jacks mounted on the slide 40 (which can be replaced by a double acting jacks) drive a rack 30a which engages a toothed wheel fixed rigidly to the arm 31.
  • the course of the rack is such that it can rotate the arm 32, as well as the arm 31 which is fast in rotation therewith, over 120° from the middle position shown in FIG. 6, to bring the head into the working position shown in FIG. 5.
  • FIG. 7 shows a modification of a welding gun without water cooling.
  • the same reference numerals are used and it is seen that only the method of fastening of the electrodes differs.
  • the fastening of the electrodes is effected by means of screws 35 passing through a threaded bore toward the thickness of the part.
  • This modification permits a gain in dimensioning, since the screws do not project and provide greater safety of screwing, due to a greater range of threading.
  • a simple solution consists in introducing, into the guide tubes in the course of welding, retaining mandrels.
  • FIGS. 8 and 9 show equipments enabling the introduction into the guide tubes of expandable mandrels, their positioning in line with the grids, i.e., at the welding locations, and then their application against the tubes. These mandrels prevent not only the deformation of the guide tubes, but also thermal unbalances between the two opposite welding spots.
  • the equipment for introducing the mandrels constitutes an autonomous unit.
  • it is borne by a carriage 49 moving over the guide rails 15 of the bed frame 14.
  • This carriage 49 and the carriage 17 bearing the welding unit will be situated, on the stand 12, on either side of the end part supporting the positioning tooling 11.
  • the carriage 49 is provided with driving and immobilizing means (not shown) which can be similar to those of the carriage 17.
  • the mandrels are placed in position by means of several flexible units 47 stored on a multiple winder 48 borne by the carriage 49.
  • the winder 48 is composed of several drums 48a rotating around parallel axes, rotated by a motor reduction unit through a double synchronizing bearing, which may be of any conventional type.
  • the step-by-step advance of the flexible units and of the mandrels can be controlled by clamps 50 provided with a clamping control and jack advancing mechanisms 51 enabling each clamp to grip the flexible element, to advance it by one step, to release the flexible element and to return to its starting position.
  • the number of flexible elements is the same as that of the guide tubes, twenty-four, for example. It may happen that one (or more) of the guide tubes are accessible only from the end part opposite carriage 49. In this case, the corresponding mandrel control device must be placed opposite the carriage 49 on the stand 12.
  • the mandrels are placed in position by hollow rods 75.
  • the drive stage of these hollow rods comprises a carriage 71 provided with a drive motor (not shown) enabling it to be moved over a path 72 parallel with the rails 15.
  • the carriage 71 bears two tubular plates 73 and 74, the holes of which have the same distribution as those of an end part 5 of the assembly.
  • On these plates are fixed hollow and rigid rods 75 equal in number to that of the guide tubes.
  • Each rod 75 bears, at its ends 76, an expandable mandrel.
  • the carriage 74 must be provided with a marking device 78 enabling the location of the mandrels to be determined precisely and their positioning in line with the grids to be welded.
  • mandrel 52 is constituted by an axially split tube to constitute several elastic fingers 53, also distributed angularly, generally four in number.
  • the fingers define an inner surface 54 which is flared outwardly.
  • a central rod 55, of which the terminal portion has a profile 56 complementary to that of the fingers, is provided at its remote end with means enabling it to be advanced towards the fingers 53 in order to separate the latter and to bring them into contact with the guide tube when the fingers are in line with the welding clamp.
  • the outer surface of the fingers 54 is machined so that it is positioned on the circle corresponding to the inner channel of the guide tube when the mandrel is expanded. This method of constituting the mandrel enables it at the most to pass more easily in line with the grids, due to the reduced radial bulk.
  • Means designed to reinforce the guide tubes during welding may have very different constitutions from those which have been described in referring to FIGS. 7 to 10.
  • the mandrels may have a shape distinct from that described above. They may include a ring of electrically conducting material constituting an intermediate electrode.
  • the sequence may be as follows:
  • the four clamps 28 are positioned, by means of jack 30, in the orientation of introducing into the network of guide tubes (head parallel to the axis of the guide tubes).
  • All the welding guns are tilted 120° to the left, which brings the electrodes of the guns onto the tongues situated in direction XX' for the tubes D1 and D7, along YY' for the tubes situated at G4 and A4.
  • the pulse generator (not shown) is actuated so as to provide current pulses of which the voltage, the intensity and the duration have been previously determined by welding of specimens.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
US06/532,929 1982-09-16 1983-09-16 Device and method of welding nuclear fuel assembly structural elements Expired - Lifetime US4587394A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8215663 1982-09-16
FR8215663A FR2533353B1 (fr) 1982-09-16 1982-09-16 Dispositif et procede de soudage d'elements de structure d'assemblage de combustible nucleaire

Publications (1)

Publication Number Publication Date
US4587394A true US4587394A (en) 1986-05-06

Family

ID=9277504

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/532,929 Expired - Lifetime US4587394A (en) 1982-09-16 1983-09-16 Device and method of welding nuclear fuel assembly structural elements

Country Status (10)

Country Link
US (1) US4587394A (fr)
EP (1) EP0105779B1 (fr)
JP (1) JPS5976680A (fr)
KR (1) KR910001981B1 (fr)
DE (1) DE3369022D1 (fr)
EG (1) EG16728A (fr)
ES (1) ES525674A0 (fr)
FR (1) FR2533353B1 (fr)
YU (1) YU46134B (fr)
ZA (1) ZA836905B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1036255C (zh) * 1990-12-24 1997-10-29 弗兰克巴尔日燃料制造公司 用于焊接核燃料组件之构件的装置
US20040144759A1 (en) * 2003-01-29 2004-07-29 Kepco Nuclear Fuel Co., Ltd. Robot spot welding apparatus for nuclear fuel skeleton and spot welding method using the same
WO2006059004A2 (fr) 2004-11-30 2006-06-08 Societe Franco-Belge De Fabrication De Combustible - Fbfc Installation de soudage de squelettes d'assemblages de combustible nucleaire, procede de programmation, procedes de soudage de squelette et de realisation d'assemblage correspondants
US20130301791A1 (en) * 2012-04-17 2013-11-14 Babcock & Wilcox Mpower Inc Pulse arc welding of spacer grids to guide tubes
CN111554423A (zh) * 2020-04-30 2020-08-18 中核北方核燃料元件有限公司 一种压水堆环形燃料组件骨架焊接电极

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2040163B1 (es) * 1991-06-26 1994-05-01 Equipos Nucleares Sa Maquina para soldar celdas.
JP3088149B2 (ja) * 1991-10-24 2000-09-18 三菱原子燃料株式会社 支持格子のスプリング操作装置
JP3137769B2 (ja) * 1992-10-22 2001-02-26 三菱原子燃料株式会社 支持格子用キーの抜取り装置
JPH06138286A (ja) * 1992-10-22 1994-05-20 Mitsubishi Nuclear Fuel Co Ltd 支持格子用キーの抜取り装置
GB2272565B (en) * 1992-11-12 1996-02-28 Nuclear Fuel Ind Ltd Apparatus for detaching a key device used for assembling of fuel assemblies
CN109175755B (zh) * 2018-09-18 2021-03-16 安徽伟宏钢结构集团股份有限公司 一种异形钢管束现场总装焊接设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2883517A (en) * 1957-09-23 1959-04-21 Boeing Co Welding apparatus and method for welding tubular skin structures
US3920950A (en) * 1973-05-25 1975-11-18 Siv Deltix Spa Welding machine with a disassemblable column
DE2610216A1 (de) * 1976-03-11 1977-09-22 Kraftwerk Union Ag Schweisszange

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2660203A (en) * 1949-05-13 1953-11-24 Herman Robert Triplett Machine for making prefabricated steel structural members
JPS5055561A (fr) * 1973-09-18 1975-05-15
JPS521904B2 (fr) * 1973-10-26 1977-01-18
JPS5140422A (en) * 1974-10-03 1976-04-05 Kojin Kk X senzoeiseireeyonno seizohoho
JPS5438244A (en) * 1977-08-31 1979-03-22 Shin Meiwa Ind Co Ltd Automatic welding machine
FR2411469A1 (fr) * 1977-12-09 1979-07-06 Leleu Sa Marcel Procede de fabrication d'un guide de grappe pour reacteur nucleaire et outillage pour la mise en oeuvre de ce procede
JPS5833075B2 (ja) * 1979-07-07 1983-07-16 伏見蒲鉾株式会社 食品用切断機
JPS5629617A (en) * 1979-08-16 1981-03-25 Nippon Steel Corp Prevention of inertia slewing of automatic brick stacker
JPS56117898A (en) * 1980-02-20 1981-09-16 Hitachi Ltd Automatic remote welding equipment for piping for narrow space

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2883517A (en) * 1957-09-23 1959-04-21 Boeing Co Welding apparatus and method for welding tubular skin structures
US3920950A (en) * 1973-05-25 1975-11-18 Siv Deltix Spa Welding machine with a disassemblable column
DE2610216A1 (de) * 1976-03-11 1977-09-22 Kraftwerk Union Ag Schweisszange

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1036255C (zh) * 1990-12-24 1997-10-29 弗兰克巴尔日燃料制造公司 用于焊接核燃料组件之构件的装置
US20040144759A1 (en) * 2003-01-29 2004-07-29 Kepco Nuclear Fuel Co., Ltd. Robot spot welding apparatus for nuclear fuel skeleton and spot welding method using the same
WO2006059004A2 (fr) 2004-11-30 2006-06-08 Societe Franco-Belge De Fabrication De Combustible - Fbfc Installation de soudage de squelettes d'assemblages de combustible nucleaire, procede de programmation, procedes de soudage de squelette et de realisation d'assemblage correspondants
US20070263760A1 (en) * 2004-11-30 2007-11-15 Societe Franco-Belge De Fabrication De Combustible Installation for Welding Frameworks of Nuclear Fuel Assemblies, Programming Method, Corresponding Methods for Framework Welding and Assembling
US20130301791A1 (en) * 2012-04-17 2013-11-14 Babcock & Wilcox Mpower Inc Pulse arc welding of spacer grids to guide tubes
CN111554423A (zh) * 2020-04-30 2020-08-18 中核北方核燃料元件有限公司 一种压水堆环形燃料组件骨架焊接电极
CN111554423B (zh) * 2020-04-30 2022-06-28 中核北方核燃料元件有限公司 一种压水堆环形燃料组件骨架焊接电极

Also Published As

Publication number Publication date
EP0105779A1 (fr) 1984-04-18
FR2533353B1 (fr) 1988-08-05
FR2533353A1 (fr) 1984-03-23
ES8500673A1 (es) 1984-11-16
EG16728A (fr) 1994-11-30
KR910001981B1 (ko) 1991-03-30
ZA836905B (en) 1985-05-29
EP0105779B1 (fr) 1987-01-07
KR850002345A (ko) 1985-05-10
YU46134B (sh) 1993-05-28
JPS5976680A (ja) 1984-05-01
DE3369022D1 (en) 1987-02-12
YU187983A (en) 1990-12-31
ES525674A0 (es) 1984-11-16
JPH0369630B2 (fr) 1991-11-01

Similar Documents

Publication Publication Date Title
US4587394A (en) Device and method of welding nuclear fuel assembly structural elements
KR101544348B1 (ko) 파이프와 플랜지 결합용 지그
US4572816A (en) Reconstituting a nuclear reactor fuel assembly
CN206305699U (zh) 一种薄壁圆筒夹具与修复薄壁圆筒裂缝的激光熔覆机
US4829660A (en) System for removing a plug from a heat exchanger tube
JP2692762B2 (ja) 核燃料棒
US4097712A (en) Method of joining nuclear fuel rod end caps and nuclear fuel rod cladding tubes
US3559278A (en) Method of manufacturing a hollow elongated thin-walled metallic body
US4347966A (en) Method for fixing a guide tube of a nuclear reactor fuel assembly
EP0219000A3 (fr) Mise de manchons dans des générateurs de vapeur
EP0201753A1 (fr) Appareil pour appliquer un bouchon à l'extrémité d'un crayon combustible nucléaire
JPH0250440B2 (fr)
JPS61253495A (ja) 核燃料棒管の端部への端栓取付装置
US4938918A (en) Element immersed in coolant of nuclear reactor
CN1036255C (zh) 用于焊接核燃料组件之构件的装置
JP2001108786A (ja) 燃料棒溶接装置
EP0151920B1 (fr) Procédé de traitement d'une barre de commande destinée à l'immersion dans un réfrigérant de réacteur nucléaire
US3507020A (en) Method of making an electron gun for a cathode ray tube and jig assembly therefor
JP3241145B2 (ja) 配管溶接用開先設定装置
US3097293A (en) Method of metals joining
US4641408A (en) Plugger guide for aligning an end plug and a fuel rod tube end
CN219074765U (zh) 筒状件辅助焊接装置
KR830001692B1 (ko) 원자로 연료 조립체의 안내관 고정장치
KR102731533B1 (ko) 헤어핀 도체의 레그의 적어도 제 1 쌍의 단부를 위치시키기 위한 장치 및 방법
KR850000146B1 (ko) 관판에 대한 다수관의 연속 용접 방법

Legal Events

Date Code Title Description
STCF Information on status: patent grant

Free format text: PATENTED CASE

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

FPAY Fee payment

Year of fee payment: 8

FEPP Fee payment procedure

Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 12